jekyll/jekyll — pull request #3220 by inukshuk (2014-12-19 14:18:57+00:00)
Title: Preserve original mtime when copying static files

Use the `preserve` option when copying static files using `FileUtils.cp`; this will preserve the file's original mtime. To preserve the original mtime of a file is important, for example, when syncing the _site folder.